they say on average the combatant commanderrers serve 2.7 years and mattis led it for 2.6 years in march when he is said to be replaced. >> bret: thank you. still ahead, meaning of transition and peaceful tran analysis of power. later, president obama transitions himself for history. first heading to break. go back to see the sites and sounds of the inaugural parad parade. they march in front of the reviewing stand. chilly day. interesting night in front of the white house. keep it here. for the new mattress models but sleep train's huge year end clearance is ending soon. for a short time, save hundreds on tempur-pedic mattresses. get the most highly-recommended bed in america at closeout prices. plus, get interest-free financing and free same-day delivery. why wait for the new models? sleep train's year end clearance is ending soon. superior service, best selection, lowest price, guaranteed. ♪ sleep train ♪ your ticket to a better night's sleep ♪ >> bret: looking live at the inaugural parade. colver academy from indiana. inside the box, the first family, president and vice preside